February 29, 1980

The Ninth Configuration (also known as Twinkle, Twinkle, "Killer" Kane) is a 1980 American psychological drama film directed by William Peter Blatty. It is based on Blatty's novel The Ninth Configuration (1978), which was itself a reworking of an earlier version of the novel, first published as Twinkle, Twinkle, "Killer" Kane! in 1966. The initial 1966 publication of the novel featured an exclamation mark at the end of the title, while all subsequent publications saw it removed.

The first half of the film has the predominant tone and style of a comic farce. In the second half, the film becomes darker as it delves deeper into its central issues of human suffering, sacrifice and faith. The film also frequently blurs the line between the sane and insane. The film was recognized with the Golden Globe Award for Best Screenplay and two other nominations at the 38th Golden Globe Awards.

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